(19)

(11)

EP 1 381 506 A1

(12)

(43) Date of publication: 21.01.2004 Bulletin 2004/04 (21) Application number: 02732723.8 (22) Date of filing: 24.04.2002

(51) International Patent Classification (IPC)7: B32B 15/01, B23K 20/08 (86) International application number: PCT/EP2002/005461 (87) International publication number: WO 2002/085615 (31.10.2002 Gazette 2002/44)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR Designated Extension States: AL LT LV MK RO SI (30) Priority: 24.04.2001 FR 0105500 (71) Applicant: Pechiney Rhenalu 75116 Paris (FR)	(72) Inventors: CATTEAU, Frédéric F-63500 ISSOIRE (FR) GODARD, David F-49460 Montreuil-Juigne (FR) (74) Representative: Mougeot, Jean-Claude  PECHINEY,217, cours Lafayette 69451 Lyon Cedex 06 69451 Lyon Cedex 06 (FR)